First, we make a diagram
To solve this problem, we have to use the basic proportionality problem.
[tex]\frac{y}{6+3}=\frac{5}{3}[/tex]Then, we solve for y
[tex]\begin{gathered} \frac{y}{9}=\frac{5}{3} \\ y=\frac{5\cdot9}{3} \\ y=15 \end{gathered}[/tex]
